The book "Systems of evolutionary equations with periodic and conditional periodic coefficients", written by Yuri Alexandrovich Mitropolsky, is a unique study in the field of mathematical physics and the theory of differential equations .. This work will be especially interesting to those who are engaged in applied mathematics, theoretical physics and engineering sciences, as well as graduate and senior students seeking to deepen their knowledge in this field. In his book, Mitropolsky touches on complex and topical topics related to evolutionary equations that describe dynamical processes in various systems. The author focuses on periodic and conditional periodic coefficients, which makes the work especially valuable for researchers working in areas where such conditions occur. The reader will be able to learn how these equations are used to model physical processes, such as wave propagation, heat transfer, and other dynamic phenomena. The book consists of several chapters, each of which examines in detail various aspects of systems of evolutionary equations. Mitropolsky uses a clear and accessible language, which allows even those who are not experts in this field to understand the basic concepts and ideas. However, despite the availability of the presentation, the work is saturated with deep mathematical calculations and theoretical foundations, which makes it useful for professionals. The topics raised in the book cover a wide range of issues, from the existence and uniqueness of solutions to their sustainability and asymptotic behavior. Mitropolsky not only offers the reader theoretical results, but also supports them with practical examples, which makes the material more clear and understandable. This combination of theory and practice is one of the strengths of the book and makes it an indispensable tool for those who want to put their knowledge into practice. The book is also distinguished by its style. Mitropolsky, as an experienced researcher and teacher, is able to present complex ideas in an accessible form, which makes reading fascinating and informative. His previous works, such as Differential Equations in Partial Derivatives and Mathematical Physics, have already established themselves as important sources of knowledge in the field of mathematical theory. In this book, the author continues to develop his ideas, offering readers new approaches and methods. "Systems of evolutionary equations with periodic and conditional periodic coefficients" will be of interest not only to specialists, but also to everyone who wants to expand their horizons in the field of mathematics and physics. The book will be an excellent addition to the library of any researcher, student or teacher seeking a deep understanding of dynamical systems and their mathematical description. If you are looking for a work that combines theoretical depth and practical applicability, this book is exactly what you need. It will help you not only to understand complex mathematical concepts, but also to apply them to real-world problems. Do not miss the opportunity to immerse yourself in the world of evolutionary equations and discover new horizons of knowledge with Yuri Alexandrovich Mitropolsky .